Mineral resources of the Soda Mountain wilderness study area,Jackson county,Oregon / W.J.Pickthorn,R.J.Goldfarb,D.Plouff и др., 1990. - 12 p. - Текст : непосредственный.
The Alaska mineral resource assessment program : Background information to accompany geologic and mineral-resource maps of the Valdez Quadrangle,south-central Alaska / G.R.Winkler,R.J.Goldfarb,W.J.Pickthorn,G.Plafker, 1992. - 25 p. - Текст : непосредственный.